20494677613 has 2 divisors, whose sum is σ = 20494677614. Its totient is φ = 20494677612.

The previous prime is 20494677563. The next prime is 20494677629. The reversal of 20494677613 is 31677649402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18934585609 + 1560092004 = 137603^2 + 39498^2 .

It is a cyclic number.

It is not a de Polignac number, because 20494677613 - 2²⁵ = 20461123181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20494677713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10247338806 + 10247338807.

It is an arithmetic number, because the mean of its divisors is an integer number (10247338807).

Almost surely, 2^20494677613 is an apocalyptic number.

It is an amenable number.

20494677613 is a deficient number, since it is larger than the sum of its proper divisors (1).

20494677613 is an equidigital number, since it uses as much as digits as its factorization.

20494677613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 49.

The spelling of 20494677613 in words is "twenty billion, four hundred ninety-four million, six hundred seventy-seven thousand, six hundred thirteen".